A bit better wording of the comment

Author: hroncok

Lib/sysconfig.py

@@ -73,8 +73,8 @@
 # correct locations.
 # The "venv" install scheme is a scheme to bootstrap virtual environments,
 # essentially identical to the default posix_prefix/nt schemes.
-# Downstream distributors will need to change this,
-# if their posix_prefix/nt scheme is not venv-compatible.
+# Downstream distributors who patch posix_prefix/nt scheme are encouraged to do
+# it after this copy is made:
 if sys.platform == 'win32':
     _INSTALL_SCHEMES['venv'] = dict(_INSTALL_SCHEMES['nt'])
 else:

Misc/NEWS.d/next/Library/2022-01-31-15-19-38.bpo-45413.1vaS0V.rst

@@ -5,5 +5,5 @@ bootstrapping new virtual environments. It is a copy of the
 instead of hardcoding the paths depending only on the platform. Downstream
 Python distributors customizing the ``"posix_prefix"`` or ``"nt"`` install
 scheme in a way that is not compatible with the install scheme used in
-virtual environments are encouraged to supply a modified working ``"venv"``
-scheme.
+virtual environments are encouraged to do it after the ``"venv"`` scheme
+is created or to supply a modified working ``"venv"`` scheme.